What is the need of DMA, even though computer have Interrupt Driven I/O mechanism? How is DMA different to I/O processors? Explain with the help of a diagram. Suggest which I/O technique will be used for each of the following situation. Give justification in support of your answer.
(i) Data input by a user during execution of a program.
(ii) Input of a stream of data over a data Communication line over a network.
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